Title : RHEOLOGY OF SCC WITH POND ASH AS PARTIAL REPLACEMENT TO FINE AGGREGATE
Authors : Bharathi Ganesh1, R Nagendra2, H Sharada Bai3, M R Suresh4, C Harisha5 and K L Krishna6
Publication : 23 - 26 October 2013
Volume :
Pages :
Price : 250
Abstract : This paper deals with an experimental study on self compacting concrete ( SCC) mixes with a cementious content of 400 kg/m3, where fine aggregate - manufactured sand - is replaced with pond ash, a thermal power plant waste, in replacement levels of [0,10,20, 30, 40, 50] % by weight. Powder type SCC mixes without the use of VMA were designed by absolute volume method and design mixes were tested for its rheology such as slump flow, V funnel, U box, and L box with a required dosage of PC based admixture. SCC mixes satisfied the rheological requirements as per EFNARC 2005, but no specific behaviour pattern corresponding to replacement levels was observed and mixes were slightly harsh and very viscous after few minutes of mixing. Pond ash particles are porous in nature and have more fines (< 150 micron size particles) contributing to the increased surface area, and hence demands more water for mixing. 28 day compressive strength of mixes up to 30% replacement of manufactured sand by pond ash was comparable with that of normal SCC, showing good potential for use in SCC as a suitable sustainable material in respect of the experimental work conducted. However, a reduction in strength of around 25% was observed at 50% replacement level, which is not desirable